Kanye West learned that lesson the hard way in Los Angeles on Friday, when he smacked his head on a street sign and subsequently flipped out on a nearby photographer — and RadarOnline.com has the video.

Kanye and pregnant girlfriend Kim Kardashian were strolling out of an underground parking garage when he walked straight into the sign.

Kim comforted Kanye for a moment, but couldn’t calm his nerves and Kanye freaked out, stalking over to a nearby group of paps, yelling, “Stop taking f**king pictures man!”

He and Kim then walked into the restaurant, but the meltdown wasn’t over and he soon emerged to unleash another expletive-filled rant on a photog.

Kanye and Kim had spent the day looking at real estate in Bel Air and while the couple already have a pad in Paris, where Kanye has decorated a baby nursery, they can’t come to a decision on where their primary residence will be.